Brake-shoe.



No. 67:1;639. Patented Mar. 2,6,4 lool.

.I. P. MCINTYBE..

BRAKE SHOE.. leation led Aug. 24. 1900 4N0 Model.)

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JAMES P. MCINTYRE, OF CHICAGO LAV, ILLINOIS.

BRAKE-SHOE.

SPECIFICATION formingpart of Letters Patent No. 670,639, dated March 26, 1901.

Application led August 24:, 1900. -serial No. 271936. VNO mOGL) v f Too/ZZ whom if may concern.:

Be it known that I, JAMES P. MCINTYRE, a citizen of the United States, residing at Chicago Lawn, in the county of Cook and Stare of Illinois, have invented certain new and usefullmprovements in Brake-Shoes; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

My invention relates to improvements in brake shoes, and particularly. to'composite brake-shoes, which employ different kinds of materials for making the shoe wear longer than shoes in ordinary use. v

It consists in a shoe provided with crossbars of denser material than the body of the shoe, said cross-bars extending through the wearing-face of the shoe, butnot projecting through the face of the shoe next to the flange of the wheel to which the'brake is to be applied.

It also consists in a shoe having a strengtheningframework made up of cross-pieces and a longitudinal piece formed of denser material than the body of the shoe, the body of the -shoe being cast around the said framework, so as to firmly hold the same in position, making the whole shoe one homogeneous mass, and yet presenting a strengthening wearing-surface where the shoe is applied for braking a wheel. y n It also consists in certain other novel constructions, combinations, and arrangements of parts, as will be hereinafter fully described and claimed.

In the accompanying drawings, Figure 1 represents a perspective view of a brake-shoe constructed in accordance with this invention. Fig. 2 represents a perspective view of the strengthening-frame mounted in the said brake-shoe. Fig. 3 is a perspective view f one of the cross-bars forV forming the composite shoe. Fig. 4 is a perspective view of a portion ofa brake-shoe, showing the wearingsurface thereof, with its strengthening crosspieces, and illustrating the fact that the said pieces do not extend through the edge of the shoe which is placed next to the flange of the wheel; and Fig. 5 is a detail vertical sectional view of a portion of the shoe, showing the strengthening-frame embedded in the cast metal thereof.

The design of the present invention is to so construct the composite shoe that the wearing-face .will be supplied with a strengthening material at intervals and a material that does not wear away so rapidly as the body portion of the shoe, and yet to soincorporate the said material inthe cast portion of the shoe that it will not come in Contact with the flanges of a wheel and prove detrimental to the same.

In embodying my invention into practical form I employ a series of cross-pieces, as 1 l, which are preferably made of wrought-iron, although I may use steel or malleable iron, if preferred. These cross-pieces are formed with notches in their ends, as at 2 2, which when c cross-pieces and adapted to extend from end to end in the shoe to strengthen the same longitudinally. The ends of this piece are preferably reduced, as at 4 4, and are arranged so as to beiush with the under surface of the shoe, as seen in Figs. l and 4 of the drawings. This strip 3 is also pro vided with a backwardly` extending portion, as at 5, which is arranged to extend through the metal at the back of the shoe and lie iiush with the surface thereof, as will appear by reference to Fig. 1 of the drawings. As seen in Fig. 4 of the drawings, the cross-pieces are so arranged in the body of the shoe as not to project through the metal at one edge thereof, whereby when the shoe is applied to a wheel and this edge is arranged next to the iian ge thereof the iiange will not receive any injury from the said strips. This is an important feature of the invention, as composite shoes heretofore have been found very detrimental to the iianges of the wheels and have often had to be discarded. The longitudinal piece 3 preferably engages a series of notches, as 6 6, formed in the cross-pieces l, the said longitudinal piece 3 fitting snugly in A vIOO the said recesses and forming, with the crosspieces, a skeleton or frame for strengthening excessive Wear of the shoe when in use.

In building up a shoe of this kind I preferably place the cross-pieces and the longitudinal piece together, as shown in Fig. 2 of the drawings, and place the same in a mold. Molten metal is then run into the mold around the said framework and the main body por* tion of the shoe is cast in its usual form. As seen in Fig. I of the drawings, the frame is so arranged in the mold that the metal Will not run around the extreme ends of the side pieces on one side of the shoe or the reduced end pieces 4, the endsof these pieces at this point being iiush With the faces of the shoe. The Whole fram eWork,l however, is arranged in one side of the mold, so that the molten metal upon the flange side of the shoe will completely cover The ends of the crosspieces, as heretofore mentioned. The shoe can be formed at the rear With the usual attaching configurations, whereby the shoe can be readily applied to any brake mechanism.

It will be evident from the above description that I am enabled to form a composite shoe which will do away with detrimental featu res and which will strengthen the shoe upon its wearing-surface in a most eilective manner, and the structure will add greatly to the effective braking power of the shoe. The cast metal running around the rear projection 5 of the piece 3 also becomes shouldered against the said piece at each end of the said projection 5, so that the piece cannot move longitudiuallyof thebrake. Thewholestructure is such that the strengthening-frame is embedded in the cast metal in such a way as to be completely shouldered in every direction and incapable of Wearing loose With the continued Wear of the shoe.

Having now described my invention, What I claim as new, and desire to secure by Letters Patent, is-

l. A brake-shoe comprising a strengtheningrame having cross-pieces and cast metal engaging said frame, said frame not eXtendcrasse ing through one edge of the shoe so as to engage the flange of a Wheel but projecting through the braking-surface of the shoe, substantially as described.

2. A brake-shoe comprising a frame made up of vcross-pieces and a longitudinal piece, the said cross-pieces and longitudinal piece having shoulders formed thereon and cast metal inclosing the said frame and engaging said shouldered portions whereby the frame will be immovably held in place in the completed shoe, substantially as described.

3. Acomposite shoe comprising cross-pieces having notches in their ends, a longitudinal piece extending from one end of the shoe to the other and engaging notches formed in the cross-pieces and cast metal formed about the said frame and engaging the notches in the ends of the cross-pieces for firmly holding the said cross-pieces in position, substantially as described.

4. A brake-shoe comprising a frame formed of cross-pieces having notched and shouldered end portions, a longitudinal piece extending from end to end of the shoe and engaging notches formed in the cross-pieces and a rear- Wardly-extending shouldered portion formed to increase its braking power, substantially as described.

In testimony whereof I hereunto affix my signature in presence of two witnesses.

JAMES P. MCINTYRE.

Witnesses:

S. H. CAMPBELL, R. BURCHIM. 

